Lodestar LS1130 Instruction Manual - 5. Operating Instructions
11
5. OPERATING INSTRUCTIONS
5.1 General Precautions
Avoid using the power supply in ambient temperatures above +40° C. Always allow
sufficient air space around the venting hole at the rear of the power supply for
effective radiation to prevent internal heat build-up.
Do not exceed the voltage rating of the circuit being powered. Many transistors and
integrated circuits will not withstand voltage of 30 volts.
5.2 Getting Started, Hook-up
1) Turn off the power supply and the equipment to be powered.
2) Connect the positive polarity of the device being powered to the red (+) terminal
of the power supply. Connect the negative polarity of the device being powered to
the black (-) terminal of the power supply.
Note: If the negative polarity of the equipment or circuit being powered is also the
chassis or common, it may be grounded to earth by strapping the black (-)
terminal to the green GND terminal. Similarly, the positive polarity can be
grounded by strapping the red (+) terminal to the green GND terminal. If an Earth
GTND reference is not required, leave the GND terminal unconnected.
3) Make sure that the hook-up leads offer sufficient current capability and low
resistance between the power supply and the circuits being powered.
5.3 Typical Constant Voltage Operation
1) Before connecting the device to be powered to the power supply, determine
the maximum safe load current for the device to be powered and set the
current limit value according to the “Setting Current Limit” procedure below.
2) Set the FINE VOLTAGE control to center and the COARSE VOLTAGE
control to a minimum (fully counterclockwise).
3) Turn off power supply and connect it to the device to be powered (see “Hook-
Up” procedure in this section).
4) Turn on POWER switch. The CV indicator should light.
5) Increase the VOLTAGE setting until the LED display reads the desired value.
The FINE CONTROL permits easier setting to a specific value
If the load current exceeds the preset current limit, the CV indicator will go off and
the CC indicator will light. In this case, the power supply automatically switches to
the constant current mode and further rotation of the VOLTAGE control will not
increase the output voltage.